frank

adjective

1. Honest, especially in a manner that seems slightly blunt; candid; not reserved or disguised.

   “May I be frank with you?”

2. Unmistakable, clinically obvious, self-evident.

   “The research probes whether treating pre-diabetes with metformin can prevent progression to frank diabetes.”

3. Unbounded by restrictions, limitations, etc.; free.

4. Liberal; generous; profuse.

noun

1. Free postage, a right exercised by governments (usually with definite article).

2. The notice on an envelope where a stamp would normally be found.

verb

1. To place a frank on an envelope.

2. To exempt from charge for postage, as a letter, package, or packet, etc.

3. To send by public conveyance free of expense.

noun

1. A hot dog or sausage.

   “Buy a package of franks for the barbecue.”

noun

1. The grey heron.